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3 Planes: Sagittal, Frontal, & Transverse. They are a combination of motions in multiple planes (IR/ER, Medial/Lateral, Anterior/Posterior)
A horizontal angle is an angle between lines on a horizontal plane.
it is the Transverse plane. the transverse, or horizontal plane is a crosswise plane that runs parallel to the ground. this imaginary cut would divide the body or its parts into upper and lower portions.
because they are parallel to the plane of the horizon
Horizontal plane Frontal plane